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고온화학세정 환경에서 EDTA가 증기발생기 구조재료에 미치는 영향 평가
이한철(Han-Chul Lee),권혁철(Hyuk-Chul Kwon),성기방(Ki-Bang Sung) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.2014 No.2
원자력발전소 증기발생기는 전열관 재질이 Alloy-600 HTMA으로 되어 있고, 2차측은 퇴적된 슬러지는 ODSCC 발생 환경을 조장한다. 증기발생기 2차측 부식생성물 제거와 함께 전열관의 응력부식균열의 발생을 억제하기 위하여 고온화학세정을 실시한다. 수행하기 전 재질 의 부식률 및 슬러지 제거량을 평가하기 위하여 Qualification Test를 하였다. 증기발생기 슬러지 제거량은 2,986kg으로 추정되며, 부식률은 최대 7.43mils로서 EPRI 권고사항인 10mils 이내로 만족하였다.
Physicochemical Treatment of Waste Water Containing Organic Materials
이한철(Lee, Han-Chul) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.1
합성 고분자 화합물의 생산과 ethanolamine(ETA, 원자력발전소에서 사용하는 pH 조절제)는 수질을 오염시키는 폐수를 발생한다. 본 연구는 유기물에 의해 유발된 COD를 감소시키기 위한 물리 · 화학적 처리법과 처리 약품을 개발하 였다. FeCl<sub>2</sub>와 MgCl<sub>2</sub>를 1/1로 혼합하여 혼합응집제를 사용함이 COD 제거효율이 가장 좋은 결과를 얻었다. 유기물을 함 유한 폐수처리에 복합응집제를 주입함으로써 COD제거율이 80%이상으로 나타났다. The production of synthetic polymer compounds and ethanolamine (ETA, a pH control agent used in nuclear power plants) generates effluent that pollutes water. This study focused on the development of chemicals for the treatment of effluent and processes to reduce the COD level due to the presence of organic materials via physicochemical treatment. It was found that a mixed coagulant of FeCl<sub>2</sub> and MgCl<sub>2</sub> (1:1) was the most effective in treating effluent and reducing the COD level. When the mixed coagulant was injected into effluent including organic materials, the COD level was reduced by more than 80%.
이한철(Lee, Han-Chul),성기방(Sung, Ki-Bang) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.4
원자력발전소 OPR-1000 CE형 증기발생기는 전열관 재질이 Alloy-600 HTMA으로 되어 있고, 2차측은 퇴적 된 슬러지로 인해 ODSCC가 발생한다. ODSCC는 관판 주변에 집중되고 있고, 슬러지 높이에 따라 영향을 받고 있다. 증기발생기 2차측 부식분위기 저감과 함께 전열관의 응력부식균열의 발생을 억제하기 위하여 부분화학세정을 실시하 였다. 슬러지 제거량은 259.2kg이고, 퇴적 슬러지 높이는 0.71인치에서 0.34인치로 낮아졌으며, 부식율은 최대 2.34mils 로서 EPRI 권고사항인 10mils 이내로 만족하였다. OPR-1000 CE Steam Generator, of which tube material is composed of Alloy-600 HTMA in nuclear power plant, secondary side is generated ODSCC(Outside Diameter Stress Corrosion Cracking) due to the accumulated sludge. ODSCC is centered around the tube sheet and is being affected depending on the height of the sludge. Chemical cleaning was carried out for a top-of-the-tube sheet(TTS) of Steam Generator in order to decrease corrosive condition of the secondary side of Steam Generator tubes and suppress the occurrence of stress corrosion cracking. The amount of sludge removal was 259.2kg. The height of the accumulated sludge was reduced from 0.71 to 0.34 inches. Corrosion rate as the maximum 2.34 mils was satisfied to within EPRI (Electric Power Research Institute) recommendation(10 mils).
QLF와 SEM을 이용한 교정환자에서 불소바니쉬의 법랑질 탈회 예방 효과 평가
이한철(Han-Chul Lee),김은정(Eun-Jeong Kim),이재영(Jae-Young Lee),백대일(Dai-Il Paik),진보형(Bo-Hyoung Jin) 대한치과재료학회 2015 대한치과재료학회지 Vol.42 No.2
Orthodontic appliances are induced deposition of dental plaque and make poor oral hygiene. During orthodontic therapy, appliances make opportunity of demineralization. For this reason, various fluoride-products are used to prevent such a demineralization. Among the fluoride-products, fluoride varnish are less dependent on patient cooperation and release for a long time in the form of thin films. Quantitative light-induced Fluorescence (QLF) is good to observe the enamel demineralization in vivo. Therefore, the purpose of this study was to investigate preventive effect of fluoride varnish in orthodontic patients using QLF methods and scanning electron microscope(SEM). This study was conducted to test 28 teeth scheduled for premolar extraction(IRB No. S-D20130018). An experimental group of premolars(#14 or #15, #34 or #35) was equipped with an orthodontic band after fluoride varnish applying, while a control group of premolars(#24 or #25, #44 or #45)was just equipped with an orthodontic band. Left side premolars(#24 or #25, #34 or #35) removed after 4 weeks. After remaining premolars(#14 or #15, #44 or #45) had applicated fluoride varnish at 4 weeks and evaluated effect remineralization. Comparing the demineralization amount is measured using QLF and SEM image analyzed the degree of preventive effect. There were significantly different of mineral reduction between before and after the application in the control group. However, the experimental group did not have any significant difference of mineral reduction between before and after the application. The difference between the experimental group and the control group was difference in the mandible than the maxilla. The experimental group applied fluoride varnish had less mineral decrease in demineralizing environment, this could be considered caries-resistant was larger than the control group not applied of fluoride varnish. However, there were no significant difference reapplication effect at 8 weeks. For orthodontic patients, fluoride varnish can prevent demineralization of the orthodontic devices by applying in advance.
Ethanolamine이 포함된 원자력발전소 2차계통 폐수처리
이한철 ( Han Chul Lee ) 한국공업화학회 2013 공업화학 Vol.24 No.1
ETA (ethanolamine)는 원자력 발전소 2차계통의 pH 조절제인 암모니아 대체 물질로 2001년부터 이용되고 있다. 환경적 측면에서 난분해성 유기물이며 현재 운영 중인 원자력 발전소 폐수처리설비로 처리가 불가능하다. 본 연구는 현장 시료를 사용하여 N와 COD 제거하기 위한 최적 공정과 사용 약품에 대하여 조사하였다. 폐수 중에 다량 함유되어 있는 ammonium ion은 diffused aeration system을 이용하여 95% 이상을 제거하고 혼합과산화물(sodium persulfate/sodium percarbonate)을 사용하여 산화시키고 응집제를 사용하여 물리, 화학적으로 처리 후 90% 이상의 제거효과를 얻을 수 있었다. ETA (ethanolamine), a pH control agent, has been used as an ammonia substitute in the secondary system of nuclear power plants since 2001. It is impossible to remove ETA from the wastewater treatment system in the nuclear power plant operating currently, because it is the non-biodegradable organics in terms of the environmental. The optimum process and chemicals for the removal of chemical oxygen demand (COD) & N with the field sample were investigated. More than 95% of Ammonium ions, contained much in wastewater, was removed with a diffused aeration system. COD could be removed over 90% through the process that includes the oxidation with mixed peroxidants (sodium persulfate/sodium percarbonate) followed by the physicochemical treatment with coagulants.
만성 특발성 변비증으로 수술을 시행한 환자의 임상적 고찰
이한철(Han Cheol Lee),홍성노(Sung No Hong),이준행(Jun Haeng Lee),이선영(Sun Young Lee),손희정(Hee Jung Son),김영호(Young Ho Kim),이풍렬(Poong Lyul Rhee),김재준(Jae J . Kim),이종철(Jong Chul Rhee),최규완(Kyoo Wan Choi),김정한(Jung Han 대한소화기기능성질환·운동학회 2001 Journal of Neurogastroenterology and Motility (JNM Vol.7 No.2
N/A Background: In patients with intractable constipation who are poorly responsive to medical treatments, surgical treatments may be considered. However, how preoperative physiologic evaluations contribute to some information in making surgical decision is not established. The aim of this study was to evaluate the outcome of surgical treatment in patients with severe constipation who underwent preoperative functional study. Methods: Preoperative functional evaluation included colon transit time test, defecography, scintigraphic gastric emptying time test, anorectal manometry and balloon expulsion test. Nine patients with a mean age of 48 years old were taken total colectomy with ileorectal anastomosis. Slow colonic transit was demonstrated in each case. All patients were available for follow-up, with median time of 35 (range; 10-55) months. Results: Seven patients (78%) were satisfied with outcome, improved the quality of life, and felt the operation was valuable despite of residual symptoms. Two patients did not experience symptom improvements. Six of seven colonic inertia or combined spastic pelvic floor syndrome patients had a satisfactory outcome. In contrast, one of two patients with generalized intestinal dysmotility did not show any improvement after surgery. Conclusions: Preoperative physiologic testing reliably identified patients with severe constipation who might have benefits from surgery. If cases are carefully diagnosed and selected, the surgical treatment may be highly effective in alleviating symptoms. (Korean Journal of Gastrointestinal Motility 2001;7:204-215)